diff --git a/src/mono/wasm/Wasm.Build.Tests/Blazor/BuildPublishTests.cs b/src/mono/wasm/Wasm.Build.Tests/Blazor/BuildPublishTests.cs
index 2f7501ebf2af7..c75f008b33210 100644
--- a/src/mono/wasm/Wasm.Build.Tests/Blazor/BuildPublishTests.cs
+++ b/src/mono/wasm/Wasm.Build.Tests/Blazor/BuildPublishTests.cs
@@ -28,7 +28,7 @@ public BuildPublishTests(ITestOutputHelper output, SharedBuildPerTestClassFixtur
     [InlineData("Release")]
     public void DefaultTemplate_WithoutWorkload(string config)
     {
-        string id = $"blz_no_workload_{config}_{Path.GetRandomFileName()}";
+        string id = $"blz_no_workload_{config}_{Path.GetRandomFileName()}_{s_unicodeChar}";
         CreateBlazorWasmTemplateProject(id);
 
         // Build
@@ -45,7 +45,11 @@ public void DefaultTemplate_WithoutWorkload(string config)
     [InlineData("Release")]
     public void DefaultTemplate_NoAOT_WithWorkload(string config)
     {
-        string id = $"blz_no_aot_{config}_{Path.GetRandomFileName()}";
+        // disable relinking tests for Unicode: github.com/emscripten-core/emscripten/issues/17817
+        // [ActiveIssue("https://github.com/dotnet/runtime/issues/83497")]
+        string id = config == "Release" ?
+            $"blz_no_aot_{config}_{Path.GetRandomFileName()}" :
+            $"blz_no_aot_{config}_{Path.GetRandomFileName()}_{s_unicodeChar}";
         CreateBlazorWasmTemplateProject(id);
 
         BlazorBuild(new BlazorBuildOptions(id, config, NativeFilesType.FromRuntimePack));
@@ -92,7 +96,7 @@ public void DefaultTemplate_NoAOT_WithWorkload(string config)
     public async Task WithDllImportInMainAssembly(string config, bool build, bool publish)
     {
         // Based on https://github.com/dotnet/runtime/issues/59255
-        string id = $"blz_dllimp_{config}_";
+        string id = $"blz_dllimp_{config}_{s_unicodeChar}";
         if (build && publish)
             id += "build_then_publish";
         else if (build)
diff --git a/src/mono/wasm/Wasm.Build.Tests/BuildPublishTests.cs b/src/mono/wasm/Wasm.Build.Tests/BuildPublishTests.cs
index f307f20e63b2f..dd05980878209 100644
--- a/src/mono/wasm/Wasm.Build.Tests/BuildPublishTests.cs
+++ b/src/mono/wasm/Wasm.Build.Tests/BuildPublishTests.cs
@@ -25,7 +25,7 @@ public BuildPublishTests(ITestOutputHelper output, SharedBuildPerTestClassFixtur
         [BuildAndRun(host: RunHost.Chrome, aot: false, config: "Debug")]
         public void BuildThenPublishNoAOT(BuildArgs buildArgs, RunHost host, string id)
         {
-            string projectName = $"build_publish_{buildArgs.Config}";
+            string projectName = $"build_publish_{buildArgs.Config}{s_unicodeChar}";
 
             buildArgs = buildArgs with { ProjectName = projectName };
             buildArgs = ExpandBuildArgs(buildArgs);
diff --git a/src/mono/wasm/Wasm.Build.Tests/BuildTestBase.cs b/src/mono/wasm/Wasm.Build.Tests/BuildTestBase.cs
index 70714e534b4d0..ca01749b2a07e 100644
--- a/src/mono/wasm/Wasm.Build.Tests/BuildTestBase.cs
+++ b/src/mono/wasm/Wasm.Build.Tests/BuildTestBase.cs
@@ -31,6 +31,7 @@ public abstract class BuildTestBase : IClassFixture<SharedBuildPerTestClassFixtu
         public const string DefaultTargetFramework = "net8.0";
         public const string DefaultTargetFrameworkForBlazor = "net8.0";
         private const string DefaultEnvironmentLocale = "en-US";
+        protected static readonly char s_unicodeChar = '煉';
         protected static readonly bool s_skipProjectCleanup;
         protected static readonly string s_xharnessRunnerCommand;
         protected string? _projectDir;
diff --git a/src/tasks/Common/Utils.cs b/src/tasks/Common/Utils.cs
index 17b915f330bae..89f2bfe122491 100644
--- a/src/tasks/Common/Utils.cs
+++ b/src/tasks/Common/Utils.cs
@@ -67,6 +67,9 @@ static string CreateTemporaryBatchFile(string command)
             using StreamWriter sw = new(file);
             if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
             {
+                // set encoding to UTF-8 -> full Unicode support is needed for usernames -
+                // `command` contains tmp dir path with the username
+                sw.WriteLine(@"%SystemRoot%\System32\chcp.com 65001>nul");
                 sw.WriteLine("setlocal");
                 sw.WriteLine("set errorlevel=dummy");
                 sw.WriteLine("set errorlevel=");
@@ -193,29 +196,6 @@ public static (int, string) TryRunProcess(
         return (process.ExitCode, outputBuilder.ToString().Trim('\r', '\n'));
     }
 
-    internal static string CreateTemporaryBatchFile(string command)
-    {
-        string extn = RuntimeInformation.IsOSPlatform(OSPlatform.Windows) ? ".cmd" : ".sh";
-        string file = Path.Combine(Path.GetTempPath(), $"tmp{Guid.NewGuid():N}{extn}");
-
-        using StreamWriter sw = new(file);
-        if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
-        {
-                sw.WriteLine("setlocal");
-                sw.WriteLine("set errorlevel=dummy");
-                sw.WriteLine("set errorlevel=");
-        }
-        else
-        {
-            // Use sh rather than bash, as not all 'nix systems necessarily have Bash installed
-            sw.WriteLine("#!/bin/sh");
-        }
-
-        sw.WriteLine(command);
-
-        return file;
-    }
-
     public static bool CopyIfDifferent(string src, string dst, bool useHash)
     {
         if (!File.Exists(src))